CN104967151B - Power system PMU layouts and correspondence bus chooses generator method and system - Google Patents
Power system PMU layouts and correspondence bus chooses generator method and system Download PDFInfo
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Abstract
The present invention relates to a kind of power system PMU points distributing methods, including：Fault set used in off-line simulation is set；Off-line simulation is carried out to fault bus to be detected using fault set corresponding multiple failures, the emulation magnitude of voltage of each bar fault bus to be detected under each corresponding failure of fault set is obtained；According to fault set and emulation magnitude of voltage, the weighted sum of emulation magnitude of voltage of each bar fault bus to be detected under the corresponding multiple failures of fault set is calculated respectively；According to the transient voltage value of power system less than the time of preset value, simulated fault start time, off-line simulation duration, pre-set low pressure value, preset high-pressure value and the weighted sum for emulating magnitude of voltage, the transient voltage unstability risk indicator value of each bar fault bus to be detected is calculated respectively；Fault bus to be detected is chosen according to transient voltage unstability risk indicator value and available PMU quantity, layouted bus as PMU.Above-mentioned power system PMU points distributing methods realize PMU reasonable disposition, improve the monitoring efficiency to power system.
Description
Technical field
The present invention relates to technical field of power systems, more particularly to a kind of power system PMU layouts and correspondence bus choosing
Take generator method and system.
Background technology
Power system is that a kind of electrical energy production being made up of links such as generating, power transformation, transmission of electricity, distribution and electricity consumptions is with consumption
System.In power system, induction conductivity is main inductive load, and the ratio for accounting for load increases increasingly.In power system hair
After raw failure, the demand sharp increase of the reactive power of induction conductivity, if idle in the receiving end AC system of electricity transmission process
The reactive power of power supply output can not meet demand, can cause falling for line voltage long period and higher magnitude, or even hold
Continuous deterioration causes collapse of voltage.In order to improve Enhancement of Transient Voltage Stability, it is necessary in time and comprehensively in monitoring power system it is crucial
The voltage of bus, and make full use of the reactive reserve of generator to support the transient voltage of power system.
The method of existing detection power system median generatrix voltage, mainly sets PMU to detect bus on bus
Voltage.Generally, due to PMU Limited Number, therefore, it is difficult to accomplish the complete considerable of whole power system, cause to electricity
The monitoring efficiency of Force system is low, realizes that the efficiency of Transient Voltage Stability is low using the reactive reserve of generator.
The content of the invention
Based on this, it is necessary to layouted and right in view of the above-mentioned problems, providing a kind of higher power system PMU of monitoring efficiency
Bus is answered to choose generator method and system.
A kind of power system PMU points distributing methods, comprise the following steps：
Fault set used in off-line simulation is set, and the fault set includes the corresponding probability of multiple failures of off-line simulation
Value；
Off-line simulation is carried out to fault bus to be detected according to the fault set corresponding multiple failures, the failure is obtained
The emulation magnitude of voltage of each bar fault bus to be detected under each corresponding failure of collection；
According to the fault set and the emulation magnitude of voltage, each bar fault bus to be detected is calculated respectively in the fault set
The weighted sum of emulation magnitude of voltage under corresponding multiple failures；
When being less than the time, simulated fault start time, off-line simulation of preset value according to the transient voltage value of power system
The weighted sum of length, pre-set low pressure value, preset high-pressure value and the emulation magnitude of voltage, calculates each bar fault bus to be detected respectively
Transient voltage unstability risk indicator value；
Fault bus to be detected is chosen according to the transient voltage unstability risk indicator value and available PMU quantity, PMU is used as
Layout bus.
A kind of power system PMU system for arranging gravity points, including：
Failure setup module, for setting the fault set used in off-line simulation, the fault set includes many of off-line simulation
The corresponding probable value of individual failure；
Off-line simulation module, it is offline for being carried out using the corresponding multiple failures of the fault set to fault bus to be detected
Emulation, obtains the emulation magnitude of voltage of each bar fault bus to be detected under each corresponding failure of the fault set；
Voltage summation module, for according to the fault set and the emulation magnitude of voltage, calculating the event to be detected of each bar respectively
Hinder the weighted sum of emulation magnitude of voltage of the bus under the corresponding multiple failures of the fault set；
Risk supervision module, is opened for being less than the time of preset value, simulated fault according to the transient voltage value of power system
Begin moment, off-line simulation duration, pre-set low pressure value, the weighted sum of preset high-pressure value and the emulation magnitude of voltage, calculates respectively each
The transient voltage unstability risk indicator value of bar fault bus to be detected；
Layout selection module, for choosing to be checked according to the transient voltage unstability risk indicator value and available PMU quantity
Fault bus is surveyed, is layouted bus as PMU.
Above-mentioned power system PMU points distributing methods and system, are carried out according to the fault set of setting to fault bus to be detected
Off-line simulation, obtains the weighted sum of the emulation magnitude of voltage under each failure that off-line simulation is obtained, according to adding for emulation magnitude of voltage
Quan He, transient voltage value are less than time of preset value, simulated fault start time, off-line simulation duration, pre-set low pressure value and pre-
If high-voltage value obtains the transient voltage unstability risk indicator value of each bar fault bus to be detected respectively, and according to transient voltage unstability
Risk indicator value and available PMU quantity are chosen fault bus to be detected and layouted bus as PMU, realize PMU reasonable disposition,
Improve the monitoring efficiency to power system.
A kind of power system correspondence bus chooses generator method, comprises the following steps：
One of failure in above-mentioned fault set is chosen, bus of being layouted respectively to each above-mentioned PMU is imitated offline
Very, each generator is layouted the idle power generating value of bus to current PMU after detection simulation failure；
According to the situation of change of the idle power generating value of each generator, obtain each generator and current PMU is layouted bus
Transient voltage enabling capabilities desired value；
Current PMU is layouted according to each generator the transient voltage enabling capabilities desired value of bus, choose current PMU cloth
The support generator of point bus.
A kind of power system correspondence bus chooses generator system, including：
Idle detection module, one of failure for choosing in above-mentioned fault set, respectively to each above-mentioned PMU
Bus of layouting carries out off-line simulation, and each generator is layouted the idle power generating value of bus to current PMU after detection simulation failure；
Detection module is supported, for the situation of change of the idle power generating value according to each generator, each generator is obtained
Current PMU is layouted the transient voltage enabling capabilities desired value of bus；
Generator chooses module, the transient voltage enabling capabilities for bus of being layouted according to each generator to current PMU
Desired value, chooses current PMU and layouts the support generator of bus.
Above-mentioned power system correspondence bus chooses generator method and system, by using a failure in fault set
Bus of being layouted to PMU carry out off-line simulation, obtain each generator each generator is layouted to current PMU bus transient state electricity
Enabling capabilities desired value, and then the transient voltage enabling capabilities desired value for bus of being layouted to current PMU according to each generator are pressed,
Choose current PMU to layout the support generator of bus, corresponding PMU can be effectively improved and layouted the Transient Voltage Stability of bus
Property, so as to improve the Enhancement of Transient Voltage Stability of power system.
Brief description of the drawings
Fig. 1 is the flow chart of power system PMU points distributing methods in one embodiment of the invention；
Fig. 2 is to choose fault bus to be detected according to Transient Instability risk indicator value and available PMU quantity to layout as PMU
The particular flow sheet of bus；
Fig. 3 is the flow chart of power system correspondence bus selection generator method in one embodiment of the invention；
Fig. 4 is the module map of power system PMU system for arranging gravity points in one embodiment of the invention；
Fig. 5 layouts shown in Fig. 4 in an embodiment chooses the specific unit figure of module；
Fig. 6 is the module map of power system correspondence bus selection generator system in one embodiment of the invention；
Fig. 7 is the flow chart of power system PMU points distributing methods in an application examples；
Fig. 8 is the flow chart of power system correspondence bus selection generator method in application examples；
Fig. 9 layouts and corresponded to the Enhancement of Transient Voltage Stability wide area that bus selection generator is obtained to combine PMU in application examples
The considerable schematic flow sheet with controllable points distributing method.
Embodiment
With reference to Fig. 1, power system PMU points distributing methods in one embodiment of the invention comprise the following steps S110 to step
S190。
S110：Fault set used in off-line simulation is set, and fault set includes the corresponding probability of multiple failures of off-line simulation
Value.
In the present embodiment, it can be set for studying the actual conditions of power system in fault set, fault set comprising M
Failure, the probability of occurrence for remembering each failure isWherein i=1,2 ..., M, meet
S130：Off-line simulation is carried out to fault bus to be detected using fault set corresponding multiple failures, fault set is obtained
The emulation magnitude of voltage of each bar fault bus to be detected under each corresponding failure.
Fault bus to be detected is needs the bus of detected voltage in power system, by fault bus to be detected
PMU is configured to detect the voltage of this bus.The fault bus to be detected selected in the present embodiment includes owning in power system
Non- pure transmission node.
When carrying out off-line simulation to fault bus to be detected using any one failure in fault set, each bar can be obtained and treated
Detect magnitude of voltage of the fault bus under failure.Therefore, emulated by each failure being respectively adopted in fault set, can be with
Obtain emulation magnitude of voltage of each bar bus under each failure.Provided with N bars fault bus to be detected, using each in fault set
Individual failure is emulated to fault bus to be detected, voltage curve of the record j-th strip bus under i-th of failure.
S150：According to fault set and emulation magnitude of voltage, each bar fault bus to be detected is calculated respectively corresponding in fault set
The weighted sum of emulation magnitude of voltage under multiple failures.
In one of the embodiments, step S150 includes formula：
In formula,For the probable value of i-th of failure in fault set, Vi,jFor voltage of the j-th strip bus under i-th of failure
Value, VjThe weighted sum for the emulation magnitude of voltage for being j-th strip bus under the corresponding multiple failures of fault set.
S170：According to the transient voltage value of power system less than time of preset value, simulated fault start time, offline imitative
True duration, pre-set low pressure value, preset high-pressure value and the weighted sum for emulating magnitude of voltage, calculate each bar fault bus to be detected respectively
Transient voltage unstability risk indicator value.
Calculate the transient voltage unstability wind of each bar fault bus to be detected respectively in a wherein embodiment, in step S170
Dangerous desired value, including formula：
υj=Dj+Sj；
In formula, VjTo emulate the weighted sum of voltage, TjFor VjLess than the time of preset value, t0For simulated fault start time,
T is off-line simulation duration, DjFor INSTABILITY CRITERION value, SjFor voltage over standard value, υjFor transient voltage unstability risk indicator value.
In the present embodiment, preset value is set to 0.8p.u..Power industry standard DL/T 1234-2013 provide transient voltage
It is transient voltage unstability that more than 0.8p.u. can not be returned in 10s.TjLess than 10s, Transient Voltage Stability, T are representedjBe more than or
Equal to 10s, transient voltage unstability, therefore, D are representedjValue can react transient voltage whether unstability.
In the present embodiment, pre-set low pressure value is 0.9p.u., and preset high-pressure value is 1.1p.u., SjBy two parts area group
Into, it is that voltage curve is less than the area that 0.9p.u. part and horizontal line 0.9p.u. are surrounded respectively, and voltage curve is higher than
The area that 1.1p.u. part and horizontal line 1.1p.u. are surrounded.Therefore, SjSize can be reflected in the fault simulation time
Voltage is less than pre-set low pressure value or the situation beyond preset high-pressure value.Voltage Drop is more serious or during bigger overshoot, Sj
Also it is bigger, illustrate that Enhancement of Transient Voltage Stability is poorer, therefore the transient voltage of the bigger bus of transient voltage unstability risk indicator value
Stable risk is bigger.
S190：Fault bus to be detected is chosen according to transient voltage unstability risk indicator value and available PMU quantity, as
PMU layouts bus.
In one of the embodiments, with reference to Fig. 2, step S190 includes step S191 to step S195.
S191：It is worth descending order according to transient voltage unstability risk indicator and chooses corresponding failure mother to be detected
Line, obtains bus collection of layouting.Wherein, the quantity for the bus to be detected that bus of layouting is concentrated is equal with available PMU quantity.
S195：The fault bus to be detected for choosing bus concentration of layouting is layouted bus as PMU.
Transient voltage unstability risk indicator value is bigger, and explanation transient voltage unstability risk is more serious, according to transient voltage unstability
The size of risk indicator value selects fault bus to be detected, layouts bus, pays the utmost attention in transient voltage unstability wind as PMU
PMU is configured on the big bus of dangerous desired value, the big bus of Transient Voltage Stability risk in power network is observed, is realized temporary
State Voltage-stabilizing Problems it is controllable, improve the efficiency of stable transient voltage.
In one of the embodiments, with continued reference to Fig. 2, after step S191, before selecting step S195, in addition to：
S192：If bus of layouting concentrates the electrical distance existed between two or more fault bus to be detected presetting
Distance is interior, then chooses to be detected fault bus of the electrical distance in pre-determined distance as screening bus collection, mark each to screen
Bus concentrates the maximum fault bus to be detected of transient voltage unstability risk indicator value and bus of layouting to concentrate and is not belonging to screening
The fault bus to be detected of bus collection, obtains marked number.
S193：According to the descending order of transient voltage unstability risk indicator value, treating outside bus collection of layouting
Detect the fault bus to be detected that specified quantity is marked in fault bus.Wherein, specified quantity be available PMU quantity with it is marked
The difference of quantity.
S194：The fault bus to be detected of mark is set to the bus collection of layouting after updating.
When two or more fault bus electrical distance to be detected is nearer, the transient characterisitics of voltage also more connect
Closely, it can select that PMU only is installed on the maximum bus of transient voltage unstability risk indicator value wherein, neither influence transient voltage
Stable ornamental, can reduce cost again.
Above-mentioned power system PMU points distributing methods, are imitated fault bus to be detected offline according to the fault set of setting
Very, the weighted sum of the emulation magnitude of voltage under each failure that off-line simulation is obtained is obtained, according to the weighted sum of emulation magnitude of voltage, temporarily
State magnitude of voltage is less than time, simulated fault start time, off-line simulation duration, pre-set low pressure value and the preset high-pressure value of preset value
The transient voltage unstability risk indicator value of each bar fault bus to be detected is obtained respectively, and according to transient voltage unstability risk indicator
Value and available PMU quantity are chosen fault bus to be detected and layouted bus as PMU, realize PMU reasonable disposition, improve to electricity
The monitoring efficiency of Force system.
With reference to Fig. 3, power system correspondence bus chooses generator method in one embodiment of the invention, comprises the following steps
S210 to step S250.
S210：One of failure in above-mentioned fault set is chosen, bus of being layouted respectively to each PMU is imitated offline
Very, each generator is layouted the idle power generating value of bus to current PMU after detection simulation failure.
S230：According to the situation of change of the idle power generating value of each generator, obtain each generator and current PMU is layouted
The transient voltage enabling capabilities desired value of bus.
In a wherein embodiment, step S230 can be：The increase of the idle power generating value of each generator is judged respectively
Whether amount is more than or equal to 20%.If so, then judging that generator is layouted the transient voltage enabling capabilities index of bus to current PMU
It is worth for 1, otherwise, it is determined that generator is layouted to current PMU, the transient voltage enabling capabilities desired value of bus is 0.It is appreciated that
In other embodiment, other can also be set to increase value as the judgement of preparatory condition.
S250：Current PMU is layouted according to each generator the transient voltage enabling capabilities desired value of bus, choose current
PMU layouts the support generator of bus.
In a wherein embodiment, step S250 refers to choose the transient voltage enabling capabilities for bus of being layouted to current PMU
Scale value is 1 generator, the support generator for bus of being layouted as current PMU.
In the present embodiment, the transient voltage enabling capabilities desired value for bus of being layouted to current PMU is 1 generator, is represented
The incrementss of the idle power generating value of generator are more than or equal to 20%, and idle exert oneself of generator significantly increases, it is believed that the generating
Machine can sense that this PMU layouts the Voltage Drop of bus, and the voltage for the bus that can be layouted to the PMU is played a supporting role.According to
Secondary each generator that obtains is layouted the transient voltage enabling capabilities desired value of bus to each bar PMU, you can finding out respectively can be right
Each bar PMU layouts the generator that the voltage of bus is played a supporting role.
Above-mentioned power system correspondence bus chooses generator method, by using a failure in fault set to PMU cloth
Point bus carry out off-line simulation, obtain each generator each generator is layouted to current PMU bus transient voltage support
Capacity index value, and then the transient voltage enabling capabilities desired value for bus of being layouted to current PMU according to each generator, choose and work as
Preceding PMU layouts the support generator of bus, can effectively improve corresponding PMU and layout the Enhancement of Transient Voltage Stability of bus, so that
Improve the Enhancement of Transient Voltage Stability of power system.
With reference to Fig. 4, power system PMU system for arranging gravity points in one embodiment of the invention, including it is failure setup module 110, offline
Emulation module 130, voltage summation module 150, risk supervision module 170 and selection module 190 of layouting.
Failure setup module 110 is used to set the fault set used in off-line simulation, and fault set includes the multiple of off-line simulation
The corresponding probable value of failure.
In the present embodiment, it can be set for studying the actual conditions of power system in fault set, fault set comprising M
Failure, the probability of occurrence for remembering each failure isWherein i=1,2 ..., M, meet
Off-line simulation module 130 is used to imitate fault bus to be detected offline using the corresponding multiple failures of fault set
Very, the emulation magnitude of voltage of each bar fault bus to be detected under each corresponding failure of fault set is obtained.
Fault bus to be detected is needs the bus of detected voltage in power system, by fault bus to be detected
PMU is configured to detect the voltage of this bus.The fault bus to be detected selected in the present embodiment includes owning in power system
Non- pure transmission node.
When carrying out off-line simulation to fault bus to be detected using any one failure in fault set, each bar can be obtained
Magnitude of voltage of the fault bus to be detected under failure.Therefore, emulated by each failure being respectively adopted in fault set, can
To obtain emulation magnitude of voltage of each bar bus under each failure.Provided with N bars fault bus to be detected, using every in fault set
One failure is emulated to fault bus to be detected, voltage curve of the record j-th strip bus under i-th of failure.
Voltage summation module 150 is used to, according to fault set and emulation magnitude of voltage, each bar fault bus to be detected is calculated respectively
The weighted sum of emulation magnitude of voltage under the corresponding multiple failures of fault set.
In one of the embodiments, voltage summation module obtains fault bus to be detected in fault set according to equation below
The weighted sum of emulation magnitude of voltage under corresponding multiple failures：
In formula,For the probable value of i-th of failure in fault set, Vi,jFor voltage of the j-th strip bus under i-th of failure
Value, VjThe weighted sum for the emulation magnitude of voltage for being j-th strip bus under the corresponding multiple failures of fault set.
Risk supervision module 170 is used for time, the simulated fault for being less than preset value according to the transient voltage value of power system
Start time, off-line simulation duration, pre-set low pressure value, preset high-pressure value and the weighted sum for emulating magnitude of voltage, calculate each bar respectively
The transient voltage unstability risk indicator value of fault bus to be detected.
In one of the embodiments, risk supervision module 170 is according to formula：
υj=Dj+Sj；
The transient voltage unstability risk indicator value of each bar fault bus to be detected is calculated respectively.
In formula, VjTo emulate the weighted sum of voltage, TjFor VjLess than the time of preset value, t0For simulated fault start time,
T is off-line simulation duration, DjFor INSTABILITY CRITERION value, SjFor voltage over standard value, υjFor transient voltage unstability risk indicator value.
In the present embodiment, preset value is set to 0.8p.u..Power industry standard DL/T 1234-2013 provide transient voltage
It is transient voltage unstability that more than 0.8p.u. can not be returned in 10s.TjLess than 10s, Transient Voltage Stability, T are representedjBe more than or
Equal to 10s, transient voltage unstability, therefore, D are representedjValue can react transient voltage whether unstability.
In the present embodiment, pre-set low pressure value is 0.9p.u., and preset high-pressure value is 1.1p.u., SjBy two parts area group
Into, it is that voltage curve is less than the area that 0.9p.u. part and horizontal line 0.9p.u. are surrounded respectively, and voltage curve is higher than
The area that 1.1p.u. part and horizontal line 1.1p.u. are surrounded.Therefore, SjSize can be reflected in the fault simulation time
Voltage is less than pre-set low pressure value or the situation beyond preset high-pressure value.Voltage Drop is more serious or during bigger overshoot, Sj
Also it is bigger, illustrate that Enhancement of Transient Voltage Stability is poorer, therefore the transient voltage of the bigger bus of transient voltage unstability risk indicator value
Stable risk is bigger.
Selection module 190 of layouting is used to choose to be detected according to transient voltage unstability risk indicator value and available PMU quantity
Fault bus, layouts bus as PMU.
In one of the embodiments, with reference to Fig. 5, selection module 190 of layouting includes：
Bus selecting unit 191, for the descending order selection pair according to transient voltage unstability risk indicator value
The fault bus to be detected answered, obtains bus collection of layouting.Wherein, the quantity for the bus to be detected that bus of layouting is concentrated is with can use
PMU quantity is equal.
Determining unit of layouting 196, the fault bus to be detected for choosing bus concentration of layouting is layouted bus as PMU.
Transient voltage unstability risk indicator value is bigger, and explanation transient voltage unstability risk is more serious, according to transient voltage unstability
The size of risk indicator value selects fault bus to be detected, layouts bus, pays the utmost attention in transient voltage unstability wind as PMU
PMU is configured on the big bus of dangerous desired value, the big bus of Transient Voltage Stability risk in power network is observed, is realized temporary
State Voltage-stabilizing Problems it is controllable, improve the efficiency of stable transient voltage.
In one of the embodiments, with continued reference to Fig. 5, selection module 190 of layouting also includes：
Electrical distance judging unit 192, for the bus concentration that judges to layout with the presence or absence of two or more to be checked
The electrical distance surveyed between fault bus is in pre-determined distance.
, there are two or more fault bus to be detected for being concentrated in bus of layouting in the first bus indexing unit 193
Between electrical distance in pre-determined distance when, choose to be detected fault bus of the electrical distance in pre-determined distance and be used as screening
Bus collection, marks each to screen bus and concentrates the maximum fault bus to be detected of transient voltage unstability risk indicator value and layout
Bus concentrates the fault bus to be detected for being not belonging to screen bus collection, obtains marked number.
Second bus indexing unit 194, for the descending order according to transient voltage unstability risk indicator value, from
The fault bus to be detected of specified quantity is marked in the fault bus to be detected layouted outside bus collection.Wherein, specified quantity is
PMU quantity and the difference of marked quantity can be used.
Data updating unit 195, for the fault bus to be detected of mark to be set into the bus collection of layouting after updating.
When two or more fault bus electrical distance to be detected is nearer, the transient characterisitics of voltage also more connect
Closely, it can select that PMU only is installed on the maximum bus of transient voltage unstability risk indicator value wherein, neither influence transient voltage
Stable ornamental, can reduce cost again.
Above-mentioned power system PMU system for arranging gravity points, the failure that off-line simulation module 130 is set according to failure setup module 110
Set pair fault bus to be detected carries out off-line simulation, and voltage summation module 150 is obtained under each failure that off-line simulation is obtained
The weighted sum of magnitude of voltage is emulated, risk supervision module 170 is less than preset value according to weighted sum, the transient voltage value of emulation magnitude of voltage
Time, simulated fault start time, off-line simulation duration, pre-set low pressure value and preset high-pressure value to obtain each bar respectively to be detected
The transient voltage unstability risk indicator value of fault bus, selection module 190 of layouting according to transient voltage unstability risk indicator value and
Fault bus to be detected can be chosen with PMU quantity to layout bus as PMU, realized PMU reasonable disposition, improved to power train
The monitoring efficiency of system.
With reference to Fig. 6, power system correspondence bus chooses generator system, including idle detection mould in one embodiment of the invention
Block 210, support detection module 230 and generator choose module 250.
Idle detection module 210 is used to choose one of failure in above-mentioned fault set, and each PMU is layouted respectively
Bus carries out off-line simulation, and each generator is layouted the idle power generating value of bus to current PMU after detection simulation failure.
Support detection module 230 to be used for the situation of change of the idle power generating value according to each generator, obtain each generating
Machine is layouted the transient voltage enabling capabilities desired value of bus to current PMU.
In a wherein embodiment, support detection module 230 specifically for judging that the idle of each generator is exerted oneself respectively
Whether the incrementss of value are more than or equal to 20%.If so, then judge generator current PMU is layouted bus transient voltage support
Capacity index value is 1, otherwise, it is determined that generator is layouted to current PMU, the transient voltage enabling capabilities desired value of bus is 0.Can
To understand, in other embodiments, other can also be set to increase value as the judgement of preparatory condition.
Generator chooses transient voltage support energy of the module 250 for bus of being layouted according to each generator to current PMU
Power desired value, chooses current PMU and layouts the support generator of bus.
In a wherein embodiment, generator chooses module 250 specifically for choosing the transient state of bus of being layouted to current PMU
Voltage support capacity index value is 1 generator, the support generator for bus of being layouted as current PMU.
In the present embodiment, the transient voltage enabling capabilities desired value for bus of being layouted to current PMU is 1 generator, is represented
The incrementss of the idle power generating value of generator are more than or equal to 20%, and idle exert oneself of generator significantly increases, it is believed that the generating
Machine can sense that this PMU layouts the Voltage Drop of bus, and the voltage for the bus that can be layouted to the PMU is played a supporting role.According to
Secondary each generator that obtains is layouted the transient voltage enabling capabilities desired value of bus to each bar PMU, you can finding out respectively can be right
Each bar PMU layouts the generator that the voltage of bus is played a supporting role.
Above-mentioned power system correspondence bus chooses generator system, by idle detection module 210 using in fault set
One failure bus of being layouted to PMU carries out off-line simulation, and each generator is layouted bus to current PMU after detection simulation failure
Idle power generating value, support detection module 230 obtains each generator to current PMU cloth according to the situation of change of idle power generating value
The transient voltage enabling capabilities desired value of point bus, generator is chosen module 250 and current PMU layouted mother according to each generator
The transient voltage enabling capabilities desired value of line, chooses current PMU and layouts the support generator of bus, can effectively improve corresponding
PMU layouts the Enhancement of Transient Voltage Stability of bus, so as to improve the Enhancement of Transient Voltage Stability of power system.
So that the above-mentioned power system PMU points distributing methods of application bus corresponding with power system chooses generator method as an example, knot
Closing the PMU selection layouted with generator, can to obtain Enhancement of Transient Voltage Stability wide area considerable with controllable points distributing method.This application
In example, the flow chart of power system PMU points distributing methods is as shown in fig. 7, provided with M failure.After completion PMU layouts, in addition it is also necessary to
Generator selection is carried out, PMU is configured on bus as shown in figure 8, setting and being layouted in K bars PMU, this K bar PMU buses of layouting are designated as
B1, B2……Bk, L platform generators all in the receiving-end system of power system are denoted as G1, G2... ... Gl.From B1Start, the
K bars PMU layouts bus BkL-th of generator reactive after the failure of a certain type in fault set, observation failure is set to exert oneself change
Change situation, bus of being layouted successively to K bars PMU carries out the off-line simulation of the type failure, selects each PMU and layouts the branch of bus
Support generator.
With reference to Fig. 9, it is that Enhancement of Transient Voltage Stability wide area is considerable with controllable points distributing method in the application example, works as failure
When, carry out closed-loop control.For example, when a certain PMU layout the voltage of bus reduced because of failure when, increase this PMU and layout
The excitation system voltage reference value of the support generator of bus.When generator is normally run, excitation system voltage reference value one
As change near 1p.u., can be on former excitation system voltage reference value plus the rank that size is a after breaking down
Jump signal, and a can use 0.1p.u., and after the voltage of power system recovers, excitation system voltage reference value is returned to initial shape
State.When PMU layouts bus-bar fault, increase the excitation system voltage reference value of corresponding support generator, support can be increased
The set end voltage of generator, and excitation voltage is maintained the longer time in high value, so as to export more dynamic reactives, improve
The Enhancement of Transient Voltage Stability of system.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. a kind of power system PMU points distributing methods, it is characterised in that comprise the following steps：
Fault set used in off-line simulation is set, and the fault set includes the corresponding probable value of multiple failures of off-line simulation；
Off-line simulation is carried out to fault bus to be detected using the fault set corresponding multiple failures, the fault set pair is obtained
The emulation magnitude of voltage of each bar fault bus to be detected under each failure answered；
According to the fault set and the emulation magnitude of voltage, each bar fault bus to be detected is calculated respectively in fault set correspondence
Multiple failures under emulation magnitude of voltage weighted sum；
According to the transient voltage value of power system less than time of preset value, simulated fault start time, off-line simulation duration, pre-
If the weighted sum of low voltage value, preset high-pressure value and the emulation magnitude of voltage, calculates the transient state of each bar fault bus to be detected respectively
Voltage Instability risk indicator value, including formula：
υj=Dj+Sj；
In formula, VjFor the weighted sum of the emulation voltage, TjFor VjLess than the time of preset value, t0When starting for the simulated fault
Carve, T is the off-line simulation duration, DjFor INSTABILITY CRITERION value, SjFor voltage over standard value, υjFor the transient voltage unstability risk
Desired value；
Fault bus to be detected is chosen according to the transient voltage unstability risk indicator value and available PMU quantity, layouted as PMU
Bus.
2. power system PMU points distributing methods according to claim 1, it is characterised in that described according to the transient voltage
Unstability risk indicator value and available PMU quantity choose fault bus to be detected, are layouted bus as PMU, including：
It is worth descending order according to the transient voltage unstability risk indicator and chooses corresponding fault bus to be detected, obtains
Layout bus collection, wherein, the quantity of the fault bus to be detected of the bus concentration of layouting is equal with available PMU quantity；
Fault bus to be detected that the bus of layouting concentrates is chosen to layout bus as the PMU.
3. power system PMU points distributing methods according to claim 2, it is characterised in that described according to the transient voltage
Unstability risk indicator is worth descending order and chooses corresponding fault bus to be detected, after the bus collection that obtains layouting, chooses
The fault bus to be detected of the bus concentration of layouting is layouted as the PMU before bus, in addition to：
If the bus of layouting, which is concentrated, has electrical distance between more than two fault bus to be detected in pre-determined distance；
To be detected fault bus of the electrical distance in pre-determined distance is then chosen as screening bus collection, marks each to screen bus
The maximum fault bus to be detected of the risk indicator of transient voltage unstability described in collection value and the bus of layouting are concentrated and are not belonging to
The fault bus to be detected of the screening bus collection, obtains marked number；
It is to be checked outside the bus collection of layouting according to the descending order of the transient voltage unstability risk indicator value
Survey in fault bus and mark the fault bus to be detected of specified quantity, wherein, the specified quantity for it is described can with PMU quantity with
The difference of the marked number；
The fault bus to be detected of mark is set to the bus collection of layouting after updating.
4. a kind of power system correspondence bus chooses generator method, it is characterised in that comprise the following steps：
One of failure in the fault set described in claim any one of 1-3 is chosen, respectively to any one of claim 1-3
Described PMU buses of layouting carry out off-line simulation, and each generator is layouted the idle of bus to current PMU after detection simulation failure
Power generating value；
According to the situation of change of the idle power generating value of each generator, obtain each generator and current PMU is layouted the temporary of bus
State voltage support capacity index value；
Current PMU is layouted according to each generator the transient voltage enabling capabilities desired value of bus, choose current PMU and layout mother
The support generator of line.
5. a kind of power system PMU system for arranging gravity points, it is characterised in that including：
Failure setup module, for setting the fault set used in off-line simulation, the fault set includes multiple events of off-line simulation
Hinder corresponding probable value；
Off-line simulation module, for being imitated offline fault bus to be detected using the corresponding multiple failures of the fault set
Very, the emulation magnitude of voltage of each bar fault bus to be detected under each corresponding failure of the fault set is obtained；
Voltage summation module, it is female for according to the fault set and the emulation magnitude of voltage, calculating each bar failure to be detected respectively
The weighted sum of emulation magnitude of voltage of the line under the corresponding multiple failures of the fault set；
Risk supervision module, when starting for being less than the time of preset value, simulated fault according to the transient voltage value of power system
The weighted sum at quarter, off-line simulation duration, pre-set low pressure value, preset high-pressure value and the emulation magnitude of voltage, calculates each bar and treats respectively
Detect the transient voltage unstability risk indicator value of fault bus；
Layout selection module, for according to the transient voltage unstability risk indicator value and available PMU quantity choose it is to be detected therefore
Hinder bus, layouted bus as PMU；
The risk supervision module is according to formula：
υj=Dj+Sj；
The transient voltage unstability risk indicator value of each bar fault bus to be detected is calculated respectively；
In formula, VjFor the weighted sum of the emulation voltage, TjFor VjLess than the time of preset value, t0When starting for the simulated fault
Carve, T is the off-line simulation duration, DjFor INSTABILITY CRITERION value, SjFor voltage over standard value, υjFor the transient voltage unstability risk
Desired value.
6. power system PMU system for arranging gravity points according to claim 5, it is characterised in that the selection module of layouting includes：
Bus selecting unit, chooses corresponding for the descending order according to the transient voltage unstability risk indicator value
Fault bus to be detected, obtains bus collection of layouting, wherein, it is described layout bus concentration fault bus to be detected quantity with can
It is equal with PMU quantity；
Layout determining unit, layouted bus as the PMU for choosing the fault bus to be detected of the bus concentration of layouting.
7. power system PMU system for arranging gravity points according to claim 6, it is characterised in that the selection module of layouting also is wrapped
Include：
Electrical distance judging unit, more than two fault bus to be detected are whether there is for judging that the bus of layouting is concentrated
Between electrical distance in pre-determined distance；
First bus indexing unit, for it there are more than two fault bus to be detected in the bus concentration of layouting between
When electrical distance is in pre-determined distance, to be detected fault bus of the electrical distance in pre-determined distance is chosen as screening bus
Collection, marks each to screen the maximum fault bus to be detected of transient voltage unstability risk indicator value described in bus collection and described
Bus of layouting concentrates the fault bus to be detected for being not belonging to the screening bus collection, obtains marked number；
Second bus indexing unit, for the descending order according to the transient voltage unstability risk indicator value, from institute
The fault bus to be detected that specified quantity is marked in the fault bus to be detected outside bus collection of layouting is stated, wherein, it is described to specify
Quantity can use PMU quantity and the difference of the marked number to be described；
Data updating unit, for the fault bus to be detected of mark to be set into the bus collection of layouting after updating.
8. a kind of power system correspondence bus chooses generator system, it is characterised in that including：
Idle detection module, it is right respectively for choosing one of failure in the fault set described in claim any one of 5-7
PMU described in claim any one of 5-7 buses of layouting carry out off-line simulation, and each generator is to current after detection simulation failure
PMU layouts the idle power generating value of bus；
Detection module is supported, for the situation of change of the idle power generating value according to each generator, each generator is obtained to working as
Preceding PMU layouts the transient voltage enabling capabilities desired value of bus；
Generator chooses module, the transient voltage enabling capabilities index for bus of being layouted according to each generator to current PMU
Value, chooses current PMU and layouts the support generator of bus.
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| CN103632313B (en) * | 2013-12-05 | 2016-09-21 | 国家电网公司 | A kind of dynamic considerable method of electrical network based on PMU data |
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Effective date of registration: 20210729 Address after: 510700 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: China Southern Power Grid Research Institute Co.,Ltd. Patentee after: TSINGHUA University Address before: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee before: China Southern Power Grid Research Institute Co.,Ltd. Patentee before: CSG POWER GRID TECHNOLOGY RESEARCH CENTER Patentee before: TSINGHUA University |